Ligand-Mediated Synthesis of Mixed-Phase Mn2+-Doped Cesium Lead Chloride Nanocrystals,ChemNanoMat

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Ligand-Mediated Synthesis of Mixed-Phase Mn2+-Doped Cesium Lead Chloride Nanocrystals
ChemNanoMat ( IF 2.6 ) Pub Date : 2021-04-07 , DOI: 10.1002/cnma.202100096
Lijia Liu ₁ , Jie Xu ₂

Affiliation

Herein we report a study on the role of alkylamine ligand in tuning the crystal structure and the luminescence of Mn²⁺-doped cesium lead chloride (Mn−CPC) nanocrystals. In a typical hot-injection synthesis of Mn−CPC, oleic acid (OA) and oleylamine (OLA) are used as the capping ligands to mediate the size and surface structure of the nanocrystals. We found that by either increasing the concentration of OLA or substituting OLA with an amine with a shorter chain length (e. g. dodecylamine), the resulted Mn−CPC contains both CsPbCl₃ and Cs₄PbCl₆ phases. The mixed-phase Mn−CPC exhibit two major photoluminescence emission bands originated from the CsPbCl₃ bandgap and the Mn d-d transition, respectively. Besides, a near-UV emission from Cs₄PbCl₆ near-band-gap exciton emission also appears and is highly sensitive to the excitation wavelength. The formation mechanism of mixed-phase Mn−CPC nanocrystals is proposed.

中文翻译：

配体介导的混合相 Mn2+ 掺杂氯化铯铅纳米晶体的合成

在此，我们报告了关于烷基胺配体在调节 Mn ²⁺掺杂的氯化铯铅 (Mn-CPC) 纳米晶体的晶体结构和发光中的作用的研究。在典型的 Mn-CPC 热注射合成中，油酸 (OA) 和油胺 (OLA) 用作封端配体来调节纳米晶体的尺寸和表面结构。我们发现，通过增加 OLA 的浓度或用链长较短的胺（例如十二烷基胺）代替 OLA，所得的 Mn-CPC 包含 CsPbCl ₃和 Cs ₄ PbCl ₆相。混合相 Mn-CPC 表现出两个主要的光致发光发射带，源自 CsPbCl ₃分别为带隙和 Mn dd 跃迁。此外，来自Cs ₄ PbCl ₆近带隙激子发射的近紫外发射也出现并且对激发波长高度敏感。提出了混合相Mn-CPC纳米晶的形成机制。

更新日期：2021-06-04

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